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The stuff I used was thin and green, not like any primer I have used before. It supposedly went with the oil-based undercoat and topcoat I used but the results were poor. The adhesion of the undercoat to the primer layer was, as I remember, very bad. I should probably have abandoned it when I got to that stage.
Sharkstar-
The green one is the new one and most pros I know stopped using the entire system when they changed from the blue to green.
The earlier blue one was superb, it's job is to soak into the bare wood fibres and retain some flexibility but allow the undercoat to adhere to it. It probably kills dolphins too, I expect that's why the formula was changed.
Airhead
It's unusual for the weathershield system to fail but the formulation of the newer water based one is nowhere near as good as the old oil based one, especially the very thin initial primer that comes with the new version is not a patch on the old one. Apparently the old one is pretty deadly to fish or something like that.